Which colour is developed to the solution when alkaline earth metals are dissolved in liquid ammonia ?

Step-by-step solution

Alkaline earth metals dissolved in liquid ammonia , analogous to alkali metals, ionize to form metal cations and free electrons, which then solvate with ammonia molecules as ammoniated electrons . These electrons are responsible for the deep blue coloration, high conductivity, and paramagnetic behavior of the solution. At higher concentrations, the solution transitions to a bronze appearance and diamagnetic character due to electron association. M(s) + (x+y)NH₃(l) [M(NH₃)_x]²⁺(am) + 2[e(NH₃)_y]^-(am) Ammoniated ele